(19)
(11) EP 2 030 840 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.10.2010 Bulletin 2010/40

(43) Date of publication A2:
04.03.2009 Bulletin 2009/10

(21) Application number: 08156897.4

(22) Date of filing: 26.05.2008
(51) International Patent Classification (IPC): 
B60R 1/06(2006.01)
B60R 1/074(2006.01)
 H02P 7/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 31.08.2007 JP 2007225855

(71) Applicant: Murakami Corporation
422-8569 Shizuoka (JP)

(72) Inventor:
  • Takemasa, Noriyuki
    Shizuoka 426-8601 (JP)

(74) Representative: von Kreisler Selting Werner 
Deichmannhaus am Dom Bahnhofsvorplatz 1
50667 Köln
50667 Köln (DE)

   


(54) Lock detection method and lock detection circuit for motor for power-folding mirror


(57) The present invention is intended to, when rotation of a mirror rotation unit in a power-folding mirror is mechanically locked and its drive motor is thereby locked, make it possible to correctly detect this locked state. A motor 10 for a power-folding mirror is reversibly driven by an H-bridge drive circuit 12 formed of FETs 1 to 4. When the motor 10 is driven in normal rotation by turning the FETs 1 and 4 on and turning the FETs 2 and 3 off, the FET 1 is periodically turned off to detect a voltage of a terminal 10a of the motor 10 by means of a voltage detection circuit 14. When the FET 1 is turned off and the motor 10 is not locked, the motor 10 generates power by means of its inertial rotation, and when locked, the motor 10 generates no power, so the voltage detected by the voltage detection circuit 14 changes according to whether or not the motor 10 is locked. A CPU 20 determines whether or not the motor 10 is locked according to the voltage detected by the voltage detection circuit 14.







Search report